path: root/drivers/mmc/host/au1xmmc.c

/*
 * linux/drivers/mmc/host/au1xmmc.c - AU1XX0 MMC driver
 *
 *  Copyright (c) 2005, Advanced Micro Devices, Inc.
 *
 *  Developed with help from the 2.4.30 MMC AU1XXX controller including
 *  the following copyright notices:
 *     Copyright (c) 2003-2004 Embedded Edge, LLC.
 *     Portions Copyright (C) 2002 Embedix, Inc
 *     Copyright 2002 Hewlett-Packard Company

 *  2.6 version of this driver inspired by:
 *     (drivers/mmc/wbsd.c) Copyright (C) 2004-2005 Pierre Ossman,
 *     All Rights Reserved.
 *     (drivers/mmc/pxa.c) Copyright (C) 2003 Russell King,
 *     All Rights Reserved.
 *

 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/* Why is a timer used to detect insert events?
 *
 * From the AU1100 MMC application guide:
 * If the Au1100-based design is intended to support both MultiMediaCards
 * and 1- or 4-data bit SecureDigital cards, then the solution is to
 * connect a weak (560KOhm) pull-up resistor to connector pin 1.
 * In doing so, a MMC card never enters SPI-mode communications,
 * but now the SecureDigital card-detect feature of CD/DAT3 is ineffective
 * (the low to high transition will not occur).
 *
 * So we use the timer to check the status manually.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/dma-mapping.h>

#include <linux/mmc/host.h>
#include <asm/io.h>
#include <asm/mach-au1x00/au1000.h>
#include <asm/mach-au1x00/au1xxx_dbdma.h>
#include <asm/mach-au1x00/au1100_mmc.h>
#include <asm/scatterlist.h>

#include <au1xxx.h>
#include "au1xmmc.h"

#define DRIVER_NAME "au1xxx-mmc"

/* Set this to enable special debugging macros */

#ifdef DEBUG
#define DBG(fmt, idx, args...) printk("au1xx(%d): DEBUG: " fmt, idx, ##args)
#else
#define DBG(fmt, idx, args...)
#endif

const struct {
	u32 iobase;
	u32 tx_devid, rx_devid;
	u16 bcsrpwr;
	u16 bcsrstatus;
	u16 wpstatus;
} au1xmmc_card_table[] = {
	{ SD0_BASE, DSCR_CMD0_SDMS_TX0, DSCR_CMD0_SDMS_RX0,
	  BCSR_BOARD_SD0PWR, BCSR_INT_SD0INSERT, BCSR_STATUS_SD0WP },
#ifndef CONFIG_MIPS_DB1200
	{ SD1_BASE, DSCR_CMD0_SDMS_TX1, DSCR_CMD0_SDMS_RX1,
	  BCSR_BOARD_DS1PWR, BCSR_INT_SD1INSERT, BCSR_STATUS_SD1WP }
#endif
};

#define AU1XMMC_CONTROLLER_COUNT (ARRAY_SIZE(au1xmmc_card_table))

/* This array stores pointers for the hosts (used by the IRQ handler) */
struct au1xmmc_host *au1xmmc_hosts[AU1XMMC_CONTROLLER_COUNT];
static int dma = 1;

#ifdef MODULE
module_param(dma, bool, 0);
MODULE_PARM_DESC(dma, "Use DMA engine for data transfers (0 = disabled)");
#endif

static inline void IRQ_ON(struct au1xmmc_host *host, u32 mask)
{
	u32 val = au_readl(HOST_CONFIG(host));
	val |= mask;
	au_writel(val, HOST_CONFIG(host));
	au_sync();
}

static inline void FLUSH_FIFO(struct au1xmmc_host *host)
{
	u32 val = au_readl(HOST_CONFIG2(host));

	au_writel(val | SD_CONFIG2_FF, HOST_CONFIG2(host));
	au_sync_delay(1);

	/* SEND_STOP will turn off clock control - this re-enables it */
	val &= ~SD_CONFIG2_DF;

	au_writel(val, HOST_CONFIG2(host));
	au_sync();
}

static inline void IRQ_OFF(struct au1xmmc_host *host, u32 mask)
{
	u32 val = au_readl(HOST_CONFIG(host));
	val &= ~mask;
	au_writel(val, HOST_CONFIG(host));
	au_sync();
}

static inline void SEND_STOP(struct au1xmmc_host *host)
{

	/* We know the value of CONFIG2, so avoid a read we don't need */
	u32 mask = SD_CONFIG2_EN;

	WARN_ON(host->status != HOST_S_DATA);
	host->status = HOST_S_STOP;

	au_writel(mask | SD_CONFIG2_DF, HOST_CONFIG2(host));
	au_sync();

	/* Send the stop commmand */
	au_writel(STOP_CMD, HOST_CMD(host));
}

static void au1xmmc_set_power(struct au1xmmc_host *host, int state)
{

	u32 val = au1xmmc_card_table[host->id].bcsrpwr;

	bcsr->board &= ~val;
	if (state) bcsr->board |= val;

	au_sync_delay(1);
}

static inline int au1xmmc_card_inserted(struct au1xmmc_host *host)
{
	return (bcsr->sig_status & au1xmmc_card_table[host->id].bcsrstatus)
		? 1 : 0;
}

static int au1xmmc_card_readonly(struct mmc_host *mmc)
{
	struct au1xmmc_host *host = mmc_priv(mmc);
	return (bcsr->status & au1xmmc_card_table[host->id].wpstatus)
		? 1 : 0;
}

static void au1xmmc_finish_request(struct au1xmmc_host *host)
{

	struct mmc_request *mrq = host->mrq;

	host->mrq = NULL;
	host->flags &= HOST_F_ACTIVE;

	host->dma.len = 0;
	host->dma.dir = 0;

	host->pio.index  = 0;
	host->pio.offset = 0;
	host->pio.len = 0;

	host->status = HOST_S_IDLE;

	bcsr->disk_leds |= (1 <<